Gordon has to protect a scientist preparing the teleporter. In Half-Life, Controllers are first seen when Gordon Freeman is about to travel to the alien world Xen via a teleporter. At close range, they shoot a single larger and more powerful fireball with homing capabilities from their opened head. At long range, they shoot a stream of small fireballs from their hands, similar to the Nihilanth's fireballs but weaker and are not too accurate. They're highly maneuverable and move around a lot to avoid getting shot at. Behavior and skills Īlien Controllers appear to be floating in a meditation pose. Since they are partially controlled by it, they may have simply died out after the Nihilanth was killed. They appear to have three eyes and a vertical mouth similar to that of Alien Grunts.Īccording to Marc Laidlaw, Controllers are part of the Nihilanth's support network. Their head is disproportionately large and can peel open like a flower to reveal a seemingly mechanical prong, resembling the one seen in the Nihilanth's head. They share many physical traits with other intelligent Xen life forms, especially the Nihilanth, and are related to the Vortigaunts as indicated by their vestigial chest-arms.

They oversee Vortigaunts and Alien Grunts, and also act as soldiers as part of the Xen military forces. Alien Controllers are floating alien creatures.

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